吹扫捕集-气相色谱-质谱法测定海岸带表层沉积物中挥发性有机物

GC-MS Determination of Volatile Organic Compounds in the Surface Sediments of Coastal Zone with Purge and Trap Concentrator

应用吹扫捕集-气相色谱-质谱法测定海岸带表层沉积物中28种挥发性有机物的含量。选定在40℃条件下吹扫捕集11min,取样品于吹扫瓶中,利用PTA 3000吹扫捕集仪直接进样,经J&W DB5-MS毛细管色谱柱分离,电子轰击电离全扫描检测,内标法进行定量测定。28种挥发性有机物的方法检出限在0.16～0.38μg.kg-1之间,样品加标回收率在70.7%～115.5%之间,相对标准偏差(n=7)在1.7%～7.8%之间。

PTA 3000 purge and trap concentrator was used in GC-MS determination of 28 volatile organic compounds （VOC＇s） in surface sediments of coastal zone. Temperature and time for purging and trapping were set at 40 ℃ and 11 min respectively. The sample was transferred from the purge and trap bottle and introduced into the instrument for GC-MS analysis. The VOC＇s were separated on J＆W DB5-MS capillary column and detected by the modes of electron ionization and full-scanning. Internal standard was adopted in the determination Values of detection limits of the method found were in the range of 0. 16--0. 38μg · kg^-1. Test for recovery were made by addition of standard VOC＇s to sample matrixes; values of recovery obtained were in the range of 70. 7 %-115.5 %. Values of RSD＇s （n=7） found for the VOC＇s were in the range of 1.70%-7. 8%.